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Appalachian coal: An overview

机译：阿巴拉契亚煤炭：概述

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Appalachian coalfields have been the predominant source of quality coals since the inception of commercial mining in the United States. In a broad sense, Appalachian coalfields can be considered those east of the Mississippi River, representing about 55 percent of total US coal production. In this special feature on Appalachia in MINING ENGINEERING, emphasis is give 10 the four coal-producing states of Pennsylvania, West Virginia, Virginia and (eastern) Kentucky. These four states produce more than 90 percent of the coal from the total Appalachian region or about 40 percent of the total US coal production. Historically, Appalachia has been the principal source of coal for domestic industries and for export. There have been numerous fluctuations in the Appalachian coal industry during the past 20 years. Appalachia was affected by cyclical and structural changes in various industries, particularly the US steel industry and changing world coal markets. It was also the region of more mine worker labor stoppages than other parts of the country. In general, the factors that affected Appalachian coal production over time are identical to those that determined changes in coal production nationally.
机译：自从美国开始商业开采以来，阿巴拉契亚煤田一直是优质煤炭的主要来源。从广义上讲，阿巴拉契亚煤田可视为密西西比河以东的那些，约占美国煤炭总产量的55％。在采矿工程中阿巴拉契亚的这一专题中，重点是宾夕法尼亚州，西弗吉尼亚州，弗吉尼亚州和肯塔基州（东部）的四个产煤州。这四个州的煤炭产量占阿巴拉契亚地区总产量的90％以上，约占美国煤炭总产量的40％。从历史上看，阿巴拉契亚一直是国内工业和出口煤炭的主要来源。在过去的20年中，阿巴拉契亚煤炭行业发生了许多波动。阿巴拉契亚州受到各种行业（尤其是美国钢铁行业和不断变化的世界煤炭市场）周期性和结构变化的影响。与该国其他地区相比，该地区也是矿工停工的地区。总的来说，影响阿巴拉契亚煤炭产量随时间变化的因素与决定全国煤炭产量变化的因素相同。

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